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The sign which accompanied the engine.

It read

Apollo Service Propulsion System Engine

The Service Module contains the main spacecraft propulsion engine, which is used to brake the spacecraft and put it into orbit around the moon and sent it on the homeward journey from the moon. The engine is also used to correct the spacecraft's course on both trips to and from the moon. About 75 percent of the Service Module's weight is in propellant for the service propulsion engine.

Apollo Service Propulsion System Engine
On loan from Space Division Rockwell International
PN 1119600-49